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33 Cards in this Set
- Front
- Back
|
function of IR spectroscopy |
infrared region
measures intramolecular vibrations and rotations |
|
|
direction of vibration frequencies ?
|
high --> low
(left end --> right end) |
|
|
frequencies:
alcohol OH |
3300
broadest |
|
|
secondary NH
|
3300
sharper |
|
|
alkyne CH
|
3300
sharpest |
|
|
alkene CH
|
3100
|
|
|
carboxylic acid OH
|
3100
|
|
|
alkane CH
|
2900
|
|
|
aldehyde CH
|
2800
|
|
|
alkyne CC bond
|
2200
|
|
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carbonyl CO bond
|
1700
|
|
|
alkene CC bond
|
1600
|
|
|
alkane CC bond
|
1200
|
|
|
ether CO bond
|
1100
|
|
|
function of NMR ?
|
measures equivalent protons in a magnetic field
|
|
|
direction of field ?
|
upfield --> downfield
(left --> right) |
|
|
which field is shielded ?
which field is deshielded ? |
upfield
downshield is deshielded |
|
|
frequencies:
carboxylic acid OH |
10 - 12
|
|
|
aldehyde CH
|
10
|
|
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Ph-H
|
7
|
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|
Ph-OH
|
7
|
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|
amide
|
7
|
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alkene CC bond
|
5
|
|
|
primary CX (alkyl halide)
|
4
|
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|
alkyne CC bond
|
3
|
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|
alcohol OH
|
3
|
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|
primary amine
|
3
|
|
|
tertiary carbon CH
|
0 - 2
|
|
|
isopropyl group shows what peaks ?
|
septet and doublet
|
|
|
function of mass spectroscopy ?
|
1. measures mol. weight of a molecule
2. identifies molecule by fragmentation patterns 3. identifies heteroatoms by their isotopic ratios |
|
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pH indicators:
red |
very acidic
|
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|
green
|
neutral
|
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purple
|
very basic
|
